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1 | /* |
2 | * Copyright 2010 Tilera Corporation. All Rights Reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation, version 2. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but | |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or | |
11 | * NON INFRINGEMENT. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | * Atomic primitives. | |
15 | */ | |
16 | ||
17 | #ifndef _ASM_TILE_ATOMIC_H | |
18 | #define _ASM_TILE_ATOMIC_H | |
19 | ||
20 | #ifndef __ASSEMBLY__ | |
21 | ||
22 | #include <linux/compiler.h> | |
23 | #include <asm/system.h> | |
24 | ||
25 | #define ATOMIC_INIT(i) { (i) } | |
26 | ||
27 | /** | |
28 | * atomic_read - read atomic variable | |
29 | * @v: pointer of type atomic_t | |
30 | * | |
31 | * Atomically reads the value of @v. | |
32 | */ | |
33 | static inline int atomic_read(const atomic_t *v) | |
34 | { | |
d356b595 | 35 | return ACCESS_ONCE(v->counter); |
867e359b CM |
36 | } |
37 | ||
38 | /** | |
39 | * atomic_sub_return - subtract integer and return | |
40 | * @v: pointer of type atomic_t | |
41 | * @i: integer value to subtract | |
42 | * | |
43 | * Atomically subtracts @i from @v and returns @v - @i | |
44 | */ | |
45 | #define atomic_sub_return(i, v) atomic_add_return((int)(-(i)), (v)) | |
46 | ||
47 | /** | |
48 | * atomic_sub - subtract integer from atomic variable | |
49 | * @i: integer value to subtract | |
50 | * @v: pointer of type atomic_t | |
51 | * | |
52 | * Atomically subtracts @i from @v. | |
53 | */ | |
54 | #define atomic_sub(i, v) atomic_add((int)(-(i)), (v)) | |
55 | ||
56 | /** | |
57 | * atomic_sub_and_test - subtract value from variable and test result | |
58 | * @i: integer value to subtract | |
59 | * @v: pointer of type atomic_t | |
60 | * | |
61 | * Atomically subtracts @i from @v and returns true if the result is | |
62 | * zero, or false for all other cases. | |
63 | */ | |
64 | #define atomic_sub_and_test(i, v) (atomic_sub_return((i), (v)) == 0) | |
65 | ||
66 | /** | |
67 | * atomic_inc_return - increment memory and return | |
68 | * @v: pointer of type atomic_t | |
69 | * | |
70 | * Atomically increments @v by 1 and returns the new value. | |
71 | */ | |
72 | #define atomic_inc_return(v) atomic_add_return(1, (v)) | |
73 | ||
74 | /** | |
75 | * atomic_dec_return - decrement memory and return | |
76 | * @v: pointer of type atomic_t | |
77 | * | |
78 | * Atomically decrements @v by 1 and returns the new value. | |
79 | */ | |
80 | #define atomic_dec_return(v) atomic_sub_return(1, (v)) | |
81 | ||
82 | /** | |
83 | * atomic_inc - increment atomic variable | |
84 | * @v: pointer of type atomic_t | |
85 | * | |
86 | * Atomically increments @v by 1. | |
87 | */ | |
88 | #define atomic_inc(v) atomic_add(1, (v)) | |
89 | ||
90 | /** | |
91 | * atomic_dec - decrement atomic variable | |
92 | * @v: pointer of type atomic_t | |
93 | * | |
94 | * Atomically decrements @v by 1. | |
95 | */ | |
96 | #define atomic_dec(v) atomic_sub(1, (v)) | |
97 | ||
98 | /** | |
99 | * atomic_dec_and_test - decrement and test | |
100 | * @v: pointer of type atomic_t | |
101 | * | |
102 | * Atomically decrements @v by 1 and returns true if the result is 0. | |
103 | */ | |
104 | #define atomic_dec_and_test(v) (atomic_dec_return(v) == 0) | |
105 | ||
106 | /** | |
107 | * atomic_inc_and_test - increment and test | |
108 | * @v: pointer of type atomic_t | |
109 | * | |
110 | * Atomically increments @v by 1 and returns true if the result is 0. | |
111 | */ | |
112 | #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0) | |
113 | ||
114 | /** | |
115 | * atomic_add_negative - add and test if negative | |
116 | * @v: pointer of type atomic_t | |
117 | * @i: integer value to add | |
118 | * | |
119 | * Atomically adds @i to @v and returns true if the result is | |
120 | * negative, or false when result is greater than or equal to zero. | |
121 | */ | |
122 | #define atomic_add_negative(i, v) (atomic_add_return((i), (v)) < 0) | |
123 | ||
124 | /** | |
125 | * atomic_inc_not_zero - increment unless the number is zero | |
126 | * @v: pointer of type atomic_t | |
127 | * | |
128 | * Atomically increments @v by 1, so long as @v is non-zero. | |
129 | * Returns non-zero if @v was non-zero, and zero otherwise. | |
130 | */ | |
131 | #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) | |
132 | ||
133 | ||
134 | /* | |
135 | * We define xchg() and cmpxchg() in the included headers. | |
136 | * Note that we do not define __HAVE_ARCH_CMPXCHG, since that would imply | |
137 | * that cmpxchg() is an efficient operation, which is not particularly true. | |
138 | */ | |
139 | ||
140 | /* Nonexistent functions intended to cause link errors. */ | |
141 | extern unsigned long __xchg_called_with_bad_pointer(void); | |
142 | extern unsigned long __cmpxchg_called_with_bad_pointer(void); | |
143 | ||
144 | #define tas(ptr) (xchg((ptr), 1)) | |
145 | ||
146 | #endif /* __ASSEMBLY__ */ | |
147 | ||
148 | #ifndef __tilegx__ | |
149 | #include <asm/atomic_32.h> | |
150 | #else | |
151 | #include <asm/atomic_64.h> | |
152 | #endif | |
153 | ||
154 | /* Provide the appropriate atomic_long_t definitions. */ | |
155 | #ifndef __ASSEMBLY__ | |
156 | #include <asm-generic/atomic-long.h> | |
157 | #endif | |
158 | ||
159 | #endif /* _ASM_TILE_ATOMIC_H */ |